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LM5176: Variation in average current regulation

Kaji@PAN
Mastermind 7805 points
Part Number: LM5176
Other Parts Discussed in Thread: LM5146

Hi,

I plan to use the LM5176 device.
I would like to ask you about variations in electrical characteristics.
The average current regulation loop is 50 mV (TYP), and product variations and variations in the entire temperature range are about 16%.
I want to use this product with as little variation as possible.
Can you show me the temperature variation data and the statistical data?

Best regards,

  • 0
    TI__Guru* 78400 points

    Hi Kaji,

    Thank  you for your interests, but the datasheet only specifies the overall variation range, and I don't understand why the statistic data would help, because you need to design to consider the worst case.

    If you want to tighter tolerance, you may consider the INAxxx device for high precision current monitor, and use that device to control the LM5176 for Constant Current operation, like the concept in the following diagram.

    2766.CC control of the LM5176.pdf

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    Mastermind 7805 points

    Thank you for your reply.

    The reason why the statistical data is necessary is that the current detection variation is narrowed down from the rated current so that it does not affect CPK.
    100% of the current detection values are inspected and not used if it exceeds the target value.
    For the reasons above, I need the data, do you have the data you can provide to me?

    Also, the circuit you proposed, can it be used with the LM5146?

    Best regards,

  • 0 in reply to Kaji@PAN
    TI__Guru* 78400 points

    Hi Kaji,

    I will check if the info is available for sharing.  If not, please use the datasheet limits as the guideline.

    Best Regards,

    Youhao

  • 0 in reply to Youhao Xi
    Mastermind 7805 points

    Thank you for your reply.
    Is it possible to tell me if a way to add an external current monitor is available for the LM5146?
    Best regards,

  • 0 in reply to Kaji@PAN
    TI__Guru* 78400 points

    Yes, you should be able to use the same scheme for the LM5146.

    By the way, I have checked with our team and the Avg current limit has very and very little dependency on temperature.  The majority of the variations are caused by process tolerances. So, you should use the datasheet limits as the design guideline.

    Thanks

    Youhao